A bar chart using Mike Bostock's pattern of reusable charts.
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September 9, 2015 16:55
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Simple D3.js Bar Chart Using Reusable Pattern
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<!DOCTYPE html> | |
<html lang="en"> | |
<head> | |
<meta charset="UTF-8"> | |
<title>Updatable Charts (3 of 4)</title> | |
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.5/d3.min.js"></script> | |
<script src="reusableBarChart.js"></script> | |
<style> | |
body { | |
padding: 20px 0 0 10px; | |
} | |
</style> | |
</head> | |
<body> | |
<div id="weatherHistory"></div> | |
<br> | |
<div id="runningHistory"></div> | |
<script> | |
var milesRun = [2, 5, 4, 1, 2, 6, 5]; | |
var highTemperatures = [77, 71, 82, 87, 84, 78, 80, 84, 86, 72, 71, 68, 75, 73, 80, 85, 86, 80]; | |
var runningChart = barChart().barPadding(2); | |
d3.select('#runningHistory') | |
.datum(milesRun) | |
.call(runningChart); | |
var weatherChart = barChart().fillColor('coral'); | |
d3.select('#weatherHistory') | |
.datum(highTemperatures) | |
.call(weatherChart); | |
</script> | |
</body> | |
</html> |
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// Using Mike Bostock's Towards Reusable Charts Pattern | |
function barChart() { | |
// All options that should be accessible to caller | |
var width = 900; | |
var height = 200; | |
var barPadding = 1; | |
var fillColor = 'steelblue'; | |
function chart(selection){ | |
selection.each(function (data) { | |
var barSpacing = height / data.length; | |
var barHeight = barSpacing - barPadding; | |
var maxValue = d3.max(data); | |
var widthScale = width / maxValue; | |
d3.select(this).append('svg') | |
.attr('height', height) | |
.attr('width', width) | |
.selectAll('rect') | |
.data(data) | |
.enter() | |
.append('rect') | |
.attr('y', function (d, i) { return i * barSpacing }) | |
.attr('height', barHeight) | |
.attr('x', 0) | |
.attr('width', function (d) { return d*widthScale}) | |
.style('fill', fillColor); | |
}); | |
} | |
chart.width = function(value) { | |
if (!arguments.length) return margin; | |
width = value; | |
return chart; | |
}; | |
chart.height = function(value) { | |
if (!arguments.length) return height; | |
height = value; | |
return chart; | |
}; | |
chart.barPadding = function(value) { | |
if (!arguments.length) return barPadding; | |
barPadding = value; | |
return chart; | |
}; | |
chart.fillColor = function(value) { | |
if (!arguments.length) return fillColor; | |
fillColor = value; | |
return chart; | |
}; | |
return chart; | |
} | |
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